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                <h1 class="kratos-entry-title text-center">JS 常用对象方法</h1>
            
            
            <ul class="kratos-post-meta text-center">
                <li><i class="fa fa-calendar"></i> 2022-02-15</li>
                <li><i class="fa fa-user"></i> 作者 cuishikang</li>
                <li>
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            <div id="expire-alert" class="alert alert-warning hidden" role="alert">
                本文最后编辑于 <time datetime="1645266178536"></time> 前，其中的内容可能需要更新。
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            <hr />
            <p>::: tip 介绍<br>JS 常用对象方法 <br><br>:::</p>
<span id="more"></span>

<h2 id="Object-keys-把对象里面的属性名-储存为一个字符串数组"><a href="#Object-keys-把对象里面的属性名-储存为一个字符串数组" class="headerlink" title="Object.keys()把对象里面的属性名 储存为一个字符串数组"></a><code>Object.keys()</code>把对象里面的属性名 储存为一个字符串数组</h2><ul>
<li>不会修改原对象内容 但是会返回一个字符串数组</li>
<li>可以把对象里面的 属性名提取出来 返回到一个字符串数组中</li>
<li>常用于 forEach 循环遍历替换 原属性名</li>
</ul>
<blockquote>
<p>使用例子</p>
</blockquote>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// 需要遍历的对象</span></span><br><span class="line">	<span class="keyword">const</span> headers = &#123;</span><br><span class="line">        <span class="string">&#x27;姓名&#x27;</span>: <span class="string">&#x27;username&#x27;</span>,</span><br><span class="line">        <span class="string">&#x27;手机号&#x27;</span>: <span class="string">&#x27;mobile&#x27;</span>,</span><br><span class="line">        <span class="string">&#x27;入职日期&#x27;</span>: <span class="string">&#x27;timeOfEntry&#x27;</span>,</span><br><span class="line">        <span class="string">&#x27;聘用形式&#x27;</span>: <span class="string">&#x27;formOfEmployment&#x27;</span>,</span><br><span class="line">        <span class="string">&#x27;转正日期&#x27;</span>: <span class="string">&#x27;correctionTime&#x27;</span>,</span><br><span class="line">        <span class="string">&#x27;工号&#x27;</span>: <span class="string">&#x27;workNumber&#x27;</span>,</span><br><span class="line">        <span class="string">&#x27;部门&#x27;</span>: <span class="string">&#x27;departmentName&#x27;</span></span><br><span class="line">      &#125;</span><br><span class="line"><span class="comment">// 遍历headers对象</span></span><br><span class="line">       <span class="title class_">Object</span>.<span class="title function_">keys</span>(headers).<span class="title function_">forEach</span>(<span class="function"><span class="params">item</span> =&gt;</span> &#123;</span><br><span class="line">        <span class="comment">// 把键值对都遍历出来</span></span><br><span class="line">        <span class="variable language_">console</span>.<span class="title function_">log</span>(item);</span><br><span class="line">    &#125;)</span><br></pre></td></tr></table></figure>

<blockquote>
<p>遍历对象</p>
</blockquote>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br></pre></td><td class="code"><pre><span class="line">const headers = &#123;</span><br><span class="line">       &#x27;姓名&#x27;: &#x27;username&#x27;,</span><br><span class="line">       &#x27;手机号&#x27;: &#x27;mobile&#x27;,</span><br><span class="line">       &#x27;入职日期&#x27;: &#x27;timeOfEntry&#x27;,</span><br><span class="line">       &#x27;聘用形式&#x27;: &#x27;formOfEmployment&#x27;,</span><br><span class="line">       &#x27;转正日期&#x27;: &#x27;correctionTime&#x27;,</span><br><span class="line">       &#x27;工号&#x27;: &#x27;workNumber&#x27;,</span><br><span class="line">       &#x27;部门&#x27;: &#x27;departmentName&#x27;</span><br><span class="line">     &#125;</span><br><span class="line">     </span><br></pre></td></tr></table></figure>



<h2 id="Object-keys-清空对象所有数据-格式化"><a href="#Object-keys-清空对象所有数据-格式化" class="headerlink" title="Object.keys()清空对象所有数据(格式化)"></a><code>Object.keys()</code>清空对象所有数据(格式化)</h2><ul>
<li>常用于对象数据的清空 重置数据</li>
</ul>
<blockquote>
<p>es6导出方法</p>
</blockquote>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// 表单清空  obj表单的数据域</span></span><br><span class="line"><span class="keyword">export</span> <span class="keyword">default</span> <span class="keyword">function</span> <span class="title function_">resetForm</span> (obj) &#123;</span><br><span class="line">  <span class="comment">// 清空数据域</span></span><br><span class="line">  <span class="title class_">Object</span>.<span class="title function_">keys</span>(obj).<span class="title function_">forEach</span>(<span class="function"><span class="params">key</span> =&gt;</span> &#123;</span><br><span class="line">    obj[key] = <span class="string">&#x27;&#x27;</span></span><br><span class="line">  &#125;)</span><br><span class="line">&#125;</span><br><span class="line"></span><br></pre></td></tr></table></figure>

<blockquote>
<p>vue入口文件注册使用 <code>main.js</code></p>
</blockquote>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// 清空表单</span></span><br><span class="line"><span class="keyword">import</span> resetForm <span class="keyword">from</span> <span class="string">&#x27;@/src/utils/resrtForm&#x27;</span></span><br><span class="line"><span class="title class_">Vue</span>.<span class="property"><span class="keyword">prototype</span></span>.<span class="property">$resetForm</span> = resetForm</span><br></pre></td></tr></table></figure>

<blockquote>
<p>vue页面调用重置方法</p>
</blockquote>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// this.addDeptModel为处理的对象  </span></span><br><span class="line"><span class="variable language_">this</span>.$resetForm(<span class="variable language_">this</span>.<span class="property">addDeptModel</span>)</span><br></pre></td></tr></table></figure>

<h2 id="Object-keys-element-ui-清空表单数据"><a href="#Object-keys-element-ui-清空表单数据" class="headerlink" title="Object.keys()element ui 清空表单数据"></a><code>Object.keys()</code>element ui 清空表单数据</h2><ul>
<li><p>原理和清空一样</p>
</li>
<li><p>常用于对象数据的清空 重置数据</p>
</li>
</ul>
<blockquote>
<p>es6导出方法</p>
</blockquote>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// 表单清空</span></span><br><span class="line"><span class="comment">// formName: 表单的ref属性  obj表单的数据域</span></span><br><span class="line"><span class="keyword">export</span> <span class="keyword">default</span> <span class="keyword">function</span> <span class="title function_">resetForm</span> (formName, obj) &#123;</span><br><span class="line">  <span class="comment">// 清空表单</span></span><br><span class="line">  <span class="keyword">if</span> (<span class="variable language_">this</span>.<span class="property">$refs</span>[formName]) &#123;</span><br><span class="line">    <span class="variable language_">this</span>.<span class="property">$refs</span>[formName].<span class="title function_">resetFields</span>()</span><br><span class="line">  &#125;</span><br><span class="line">  <span class="comment">// 清空数据域</span></span><br><span class="line">  <span class="title class_">Object</span>.<span class="title function_">keys</span>(obj).<span class="title function_">forEach</span>(<span class="function"><span class="params">key</span> =&gt;</span> &#123;</span><br><span class="line">    obj[key] = <span class="string">&#x27;&#x27;</span></span><br><span class="line">  &#125;)</span><br><span class="line">&#125;</span><br><span class="line"></span><br></pre></td></tr></table></figure>

<blockquote>
<p>vue入口文件注册使用 <code>main.js</code></p>
</blockquote>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// 清空表单</span></span><br><span class="line"><span class="keyword">import</span> resetForm <span class="keyword">from</span> <span class="string">&#x27;@/src/utils/resrtForm&#x27;</span></span><br><span class="line"><span class="title class_">Vue</span>.<span class="property"><span class="keyword">prototype</span></span>.<span class="property">$resetForm</span> = resetForm</span><br></pre></td></tr></table></figure>

<blockquote>
<p>vue页面调用重置方法</p>
</blockquote>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// this.addDeptModel为处理的对象 </span></span><br><span class="line"> <span class="variable language_">this</span>.$resetForm(<span class="string">&#x27;addDeptForm&#x27;</span>, <span class="variable language_">this</span>.<span class="property">addDeptModel</span>)</span><br></pre></td></tr></table></figure>

<h2 id="Object-keys-快速复制-不存在的key不复制"><a href="#Object-keys-快速复制-不存在的key不复制" class="headerlink" title="Object.keys() 快速复制 不存在的key不复制"></a><code>Object.keys()</code> 快速复制 不存在的key不复制</h2><ul>
<li>适合拷贝对象 并且只拷贝你生成过的key 不生成的不拷贝</li>
</ul>
<blockquote>
<p>数据类型</p>
</blockquote>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// 要拷贝的对象</span></span><br><span class="line"><span class="attr">addDeptModel</span>: &#123;</span><br><span class="line">  <span class="attr">editType</span>: <span class="string">&#x27;&#x27;</span>,</span><br><span class="line">  <span class="attr">id</span>: <span class="string">&#x27;&#x27;</span>,</span><br><span class="line">  <span class="attr">pid</span>: <span class="string">&#x27;&#x27;</span>,</span><br><span class="line">  <span class="attr">parentName</span>: <span class="string">&#x27;&#x27;</span>,</span><br><span class="line">  <span class="attr">manager</span>: <span class="string">&#x27;&#x27;</span>,</span><br><span class="line">&#125;,</span><br><span class="line"><span class="comment">// 拷贝到的对象</span></span><br><span class="line">   <span class="title class_">DeptModel</span>: &#123;</span><br><span class="line">  <span class="attr">editType</span>: <span class="string">&#x27;&#x27;</span>,</span><br><span class="line">  <span class="attr">id</span>: <span class="string">&#x27;&#x27;</span>,</span><br><span class="line">  <span class="attr">pid</span>: <span class="string">&#x27;&#x27;</span>,</span><br><span class="line">&#125;, <span class="comment">// 这个时候只拷贝存在的key 其他的key不拷贝</span></span><br></pre></td></tr></table></figure>

<blockquote>
<p>es6导出方法</p>
</blockquote>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// 对象的快速复制  不存在的key不复制</span></span><br><span class="line"><span class="keyword">export</span> <span class="keyword">default</span> <span class="keyword">async</span> <span class="keyword">function</span> <span class="title function_">objCoppy</span> (obj1, obj2) &#123;</span><br><span class="line">  <span class="title class_">Object</span>.<span class="title function_">keys</span>(obj2).<span class="title function_">forEach</span>(<span class="function"><span class="params">key</span> =&gt;</span> &#123;</span><br><span class="line">    obj2[key] = obj1[key]</span><br><span class="line">  &#125;)</span><br><span class="line">&#125;</span><br><span class="line"></span><br></pre></td></tr></table></figure>

<blockquote>
<p>vue入口文件注册使用 <code>main.js</code></p>
</blockquote>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// 数据的快速复制</span></span><br><span class="line"><span class="keyword">import</span> objCoppy <span class="keyword">from</span> <span class="string">&#x27;../src/utils/objCoppy&#x27;</span></span><br><span class="line"><span class="title class_">Vue</span>.<span class="property"><span class="keyword">prototype</span></span>.<span class="property">$objCoppy</span> = objCoppy</span><br></pre></td></tr></table></figure>

<blockquote>
<p>vue页面调用拷贝方法</p>
</blockquote>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="variable language_">this</span>.$resetForm(<span class="variable language_">this</span>.<span class="property">addDeptModel</span>, <span class="variable language_">this</span>.<span class="property">DeptModel</span>) <span class="comment">// 旧的在前 新的在后</span></span><br></pre></td></tr></table></figure>



<h2 id="object-assign-合并对象中的属性-浅拷贝"><a href="#object-assign-合并对象中的属性-浅拷贝" class="headerlink" title="object.assign()合并对象中的属性(浅拷贝)"></a><code>object.assign()</code>合并对象中的属性(浅拷贝)</h2><ul>
<li><p>适用于合并两个对象 并且指定保留那个对象(合并储存的对象)</p>
</li>
<li><p>不会修改合并储存对象里面的原数据 只是继续添加数据</p>
</li>
<li><p><code>object.assign()</code> 有n个参数 但是参数1是 指定储存合并的对象</p>
<ul>
<li>参数1是 指定储存合并的对象( 自己可以拥有原数据 并不会覆盖原数据 )</li>
<li>参数2 需要合并的对象</li>
<li>参数3 需要合并的对象</li>
</ul>
<p>…..</p>
</li>
<li><p>注意，如果目标对象与源对象有同名属性，或多个源对象有同名属性，则后面的属性会覆盖前面的属性。</p>
</li>
</ul>
<blockquote>
<p>使用例子</p>
</blockquote>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// 合并储存的对象</span></span><br><span class="line"><span class="keyword">const</span> target = &#123; </span><br><span class="line">               		 <span class="attr">a</span>: <span class="number">1</span></span><br><span class="line">               &#125;;</span><br><span class="line"><span class="comment">// 需要合并的对象1</span></span><br><span class="line"><span class="keyword">const</span> source1 = &#123; </span><br><span class="line">                	<span class="attr">b</span>: <span class="number">2</span></span><br><span class="line">               &#125;;</span><br><span class="line"><span class="comment">// 需要合并的对象2</span></span><br><span class="line"><span class="keyword">const</span> source2 = &#123; </span><br><span class="line">					<span class="attr">c</span>: <span class="number">3</span> </span><br><span class="line">				&#125;;</span><br><span class="line"><span class="comment">// 进行对象合并</span></span><br><span class="line"><span class="title class_">Object</span>.<span class="title function_">assign</span>(target, source1, source2);</span><br><span class="line"><span class="comment">//---------------------- 合并后的target值</span></span><br><span class="line">target &#123;</span><br><span class="line">        <span class="attr">a</span>:<span class="number">1</span>,</span><br><span class="line">        <span class="attr">b</span>:<span class="number">2</span>,</span><br><span class="line">        <span class="attr">c</span>:<span class="number">3</span></span><br><span class="line">	&#125;</span><br></pre></td></tr></table></figure>

<h2 id="hasOwnProperty-对象中判断指定键-属性名-是否存在"><a href="#hasOwnProperty-对象中判断指定键-属性名-是否存在" class="headerlink" title="hasOwnProperty()对象中判断指定键(属性名)是否存在"></a><code>hasOwnProperty()</code>对象中判断指定键(属性名)是否存在</h2><ul>
<li>我们想判断一个字段是是否在对象中存在 需要用到<code>hasOwnProperty()</code>方法 <a target="_blank" rel="noopener" href="https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Global_Objects/Object/hasOwnProperty">详见</a></li>
</ul>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">&lt;span v-if=&quot;data.hasOwnProperty(&#x27;children&#x27;)&quot; /&gt;</span><br></pre></td></tr></table></figure>

<ul>
<li>这样就可以判断 <code>data</code>对象中 是否包含<code>children</code>键(属性名)</li>
</ul>
<blockquote>
<p>其他例子</p>
</blockquote>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">const</span> object1 = &#123;&#125;;</span><br><span class="line">object1.<span class="property">property1</span> = <span class="number">42</span>;</span><br><span class="line"></span><br><span class="line"><span class="variable language_">console</span>.<span class="title function_">log</span>(object1.<span class="title function_">hasOwnProperty</span>(<span class="string">&#x27;property1&#x27;</span>));</span><br><span class="line"><span class="comment">// expected output: true</span></span><br><span class="line"></span><br><span class="line"><span class="variable language_">console</span>.<span class="title function_">log</span>(object1.<span class="title function_">hasOwnProperty</span>(<span class="string">&#x27;toString&#x27;</span>));</span><br><span class="line"><span class="comment">// expected output: false</span></span><br></pre></td></tr></table></figure>

<h2 id="替换JSON对象的key"><a href="#替换JSON对象的key" class="headerlink" title="替换JSON对象的key"></a>替换JSON对象的key</h2><ul>
<li>如果后端返回的数据 不是你需要的key 这个时候你就可以替换key 用你想用key</li>
</ul>
<blockquote>
<p>假设数据这个样子</p>
</blockquote>
<p><img src="https://jinyanlong-1305883696.cos.ap-hongkong.myqcloud.com/image-20211222194909818.png" alt="image-20211222194909818"></p>
<ul>
<li>这个时候 你想把<code>id</code>替换成value <code> region_name</code>替换成text 需要用到<code>replace</code>这个方法 通过正则来替换key 替换成自己想要的</li>
</ul>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line">  <span class="comment">// 接收数据</span></span><br><span class="line"><span class="keyword">const</span> ret = res.<span class="property">data</span>.<span class="property">data</span></span><br><span class="line">  <span class="comment">// 处理数据b</span></span><br><span class="line"><span class="keyword">const</span> changeObject = <span class="title class_">JSON</span>.<span class="title function_">parse</span>(<span class="title class_">JSON</span>.<span class="title function_">stringify</span>(ret).<span class="title function_">replace</span>(<span class="regexp">/region_name/g</span>, <span class="string">&quot;text&quot;</span>).<span class="title function_">replace</span>(<span class="regexp">/id/g</span>, <span class="string">&quot;value&quot;</span>));</span><br></pre></td></tr></table></figure>

<p><img src="https://jinyanlong-1305883696.cos.ap-hongkong.myqcloud.com/image-20211222195215458.png" alt="image-20211222195215458"></p>
<ul>
<li>这样数据就处理好啦</li>
</ul>
<h2 id="从数组中的对象取出特定字段并生成新的数组"><a href="#从数组中的对象取出特定字段并生成新的数组" class="headerlink" title="从数组中的对象取出特定字段并生成新的数组"></a>从数组中的对象取出特定字段并生成新的数组</h2><ul>
<li>如果后端返回的数组对象中的数据你想单独拎出来放到一个数组中 就需要通过<code>map</code>来把该字段洗出来</li>
</ul>
<p><img src="https://jinyanlong-1305883696.cos.ap-hongkong.myqcloud.com/image-20211225211500239.png" alt="image-20211225211500239"></p>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// 假设这个是你要处理的该数组对象</span></span><br><span class="line"><span class="keyword">const</span> ret = res.<span class="property">data</span>.<span class="property">data</span></span><br><span class="line"><span class="comment">// 把数组对象用map洗出来</span></span><br><span class="line"><span class="keyword">const</span> rtx = ret.<span class="title function_">map</span>(<span class="function"><span class="params">e</span> =&gt;</span> &#123;</span><br><span class="line">    <span class="keyword">return</span> e.<span class="property">real_img_src</span></span><br><span class="line">&#125;)</span><br><span class="line"><span class="comment">// 这里就是你想要的数组内容</span></span><br><span class="line"><span class="variable language_">console</span>.<span class="title function_">log</span>(rtx)</span><br></pre></td></tr></table></figure>

<ul>
<li>洗完后的数据</li>
</ul>
<p><img src="https://jinyanlong-1305883696.cos.ap-hongkong.myqcloud.com/image-20211225211916673.png" alt="image-20211225211916673"></p>

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